JPH03102483A - Assembling type one chip microcomputer for automobile and program developing device - Google Patents

Abstract

PURPOSE:To easily perform the generation, change, and verification of a control program even by a general programmer by providing a ROM, a RAM, and an input/output port, and describing the control program running on them in high-level language. CONSTITUTION:One example of arithmetic equation for a targeted blow-off temperature Tdo is shown in equation I. In this example, a reference blow-off temperature is assumed as f(Ta)=40-Ka.Ta, an outside air temperature as Ta, a quantity of solar radiation as Zm, a control targeted room temperature as Tso, a car room temperature as Tr, and control constants as Ka, Kz, and Kr. And the arithmetic operation of equation I is described in the high-level language. Figure shows the example describing the arithmetic equation in C- language frequently used as language for microcomputer control. In such a way, programming can be remarkably simplified, and the description itself of a program can be performed by the one almost same as in the arithmetic equation, and the generation of the program and the change of arithmetic specification can be remarkably simplified compared with assembler language.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an embedded one-chip microcomputer for automobiles and a program development device.

[Prior art] Automotive microcomputer (hereinafter referred to as microcomputer II)
i8 name) Ha, Enshinno A Tue■ mNiklJ'8.
It is used for x7 controller control, h-transmission control, active suspension control, brake control, etc., and it is common to prepare a dedicated microcontroller for each control function.

As such an L-chip microcomputer, for example,
There is one for air conditioner control shown in 3-oJ-s9, and its control program is created according to the electronic circuit designed for control. J for cars like this
The control program l1 of a chip microcomputer is usually written in assembly language (or machine language) for two reasons: (1) memory (ROM.RA);
M) Capacity constraints are severe.

(2) Fast processing speed is required.

Considering (1) here, since it is extremely important to reduce the cost of automobile parts, cost-effective 4-bit or 8-bit 1-chip microcomputers have been used as microcomputers. However, L-chip microcontrollers are limited to R. OM. Only a small amount of RAM can be built-in, and in order to satisfy the control specifications necessary for these r4js, the program is the most compact, and RAM is required.
I had no choice but to write the program in assembly language, which can be used effectively. In order to escape from memory capacity constraints, a separate chip ROM. When you add RAM, the additional ROM. In addition to RAM, IC for address data
Space is required for wiring patterns on the printed circuit board for connections between chips, etc., resulting in an increase in the number of components, an increase in the size of the control circuit, and a significant increase in fdb rating.

On the other hand, if we consider condition (2), the processing speed of conventional microcontrollers is relatively slow, so as the number of program steps increases, the time required for the main program cycle increases, and the response of the control system increases. Sexuality gradually worsens. Although this is greatly influenced by the structure of the interrupt processing program, it is not uncommon for one cycle of the main program to take about 0.5 seconds. Therefore, in order to improve the responsiveness of the control system, it is required that the number of steps required for the program cycle be as small as possible, and based on this condition, the assembly language is the most compact program and provides the fastest processing speed. had no choice but to use.

[An open problem to be solved by the invention] Assembly language has the advantage that programs to be executed can be made compact, memory capacity can be reduced, and processing speed can be increased. Since the program is written step by step, the programming work is complicated, the meaning of the program is difficult to understand, and the number of lines in the program list increases. Therefore, there are the following problems.

(1) It is difficult to create or modify a control program unless you are one of the few programmers who can use assembly language, and it takes a long time to verify the program.

(2) Assembly language is completely incompatible between microcontrollers of different architectures, so when changing microcontroller models, all programs must be rewritten.
In addition, modifying and changing programs requires equipment with the same architecture as the microcomputer used, which makes it difficult to change programs immediately in a laboratory or during outdoor driving experiments.

(3) It is difficult to incorporate functions such as recording data inside the microcontroller and displaying it externally during experiments to confirm operation due to memory capacity constraints, making it difficult to verify control responsiveness and determine specifications. .

(4) What is the program development device and the final microcomputer product?
In general, since the architectures are different, it is necessary to partially change the program (particularly changes related to input/output processing) when transferring a program that has been tested on the development device to the final product, which may improve workability. Program reliability decreases.

It is an object of the present invention to enable general programmers who are not trained to handle assembly languages to create control programs.
Changes and verification can be easily performed, there is no need to change the control program even if the microcontroller model is changed, it is easy to change the program at the experiment site, and the program created with the program development device can be directly executed on the microcontroller. The purpose of the present invention is to provide an embedded one-chip microcontroller for automobiles.

[Means for solving the problem] The above objectives are achieved by writing the control program in a high-level language, and by using a common specification for the program development device and the operating system (hereinafter referred to as OS) for the control program. This is achieved by running a control program on the development device to directly control the target device, and further achieved by realizing input processing by system call operation to the OS. Ru.

[Function] Due to recent advances in integration technology, large-capacity ROM. ．． Equipped with RAM and improved processing speed (16-bit microcontroller, 32-bit microcontroller), it is becoming possible to program in high-level languages. Therefore, if you write a control program in the high-level language Hti instead of the conventional assembly language,
High-level languages are easy to understand and easy to program, so even people other than specific programmers can easily create or change control programs, and the number of program lines is a fraction of that of assembly language. The program development, maintenance, and verification becomes easier. Furthermore, if you install a compiler that matches the microcontroller you are using,
Since high-level languages are compatible with any microcontroller, it is possible to change microcontroller models without changing the control program.

-7 In addition, by making the OS of the program development device and the OS of the microcomputer common, the operating environment of the control program will be the same on the development device and the microcomputer, and the control program verified on the development device will not change. It can be transferred to the control device without any trouble. Therefore, there is no need to modify part of the program to match the control device, which helps shorten the work period and prevent new mistakes from occurring. In addition, since the program in the program development device can directly control the actual target device, the program development device's large capacity RAM and input/output functions with other recording devices and external devices can be utilized. Record and analyze arbitrary data, and vehicles.
Program changes can be easily made during experiments in the second class.

Furthermore, by using system calls to the OS for input/output processing of control programs, differences in addresses and processing procedures for input/output parts between development equipment and microcontroller models are hidden inside the OS. Because it is hidden away, it is not visible from the control program, and the same control program can be used regardless of the microcomputer model, parts used, or the structure of the device.

[Example] Hereinafter, the present invention will be explained in detail using a one-chip microcomputer for controlling an automobile air conditioner as an example. Figure 2 shows the overall structure of the air conditioner. Air sucked in from the outside air intake port 4 or the inside air intake port 5 depending on the opening degree of the intake door 10 is sent to the evaporator 2 by the blower motor 1 and cooled. . Next, depending on the opening degree of the upper air mix door 11 and the lower air mix door J2, the cold air bypassing the heater core 3 and the air reheated by passing through the heater core 3 are mixed on the downstream side, and a floor for switching the outlet is mixed. 1 to 713 and the opening degree of pen 1 to door 14 as temperature-controlled air from differential air outlet 6 (to Freon 1 to glass), vent air outlet 7 (to the occupant's upper body), and floor outlet 8 (to the occupant's feet). The air is blown into the vehicle interior, and the temperature inside the vehicle interior is controlled.

The control device 20, the differential duct 1 to sensor 2 which detect the temperature of the air blown from the differential air outlet 6], the pen 1 to duct sensor 22 which detect the temperature of the air blown from the vent outlet 7, and the temperature of the air blown from the floor air outlet 8. Floor duct sensor 23 to detect
, the outside temperature sensor 24 that detects the air temperature outside the vehicle interior, the vehicle room temperature sensor 25 that detects the air temperature inside the vehicle interior, and the solar radiation sensor 27 that detects the intensity of solar radiation are input, and each door 10 to The control panel controls the electric actuators 15 to 19 that adjust the opening degree of the air conditioner 14 and the blower motor 1, and is equipped with switches for the occupants to operate various air conditioners and a display device for informing the occupants of the operating status of the air conditioner. It has 26.

FIG. 3 shows a more detailed configuration of this control device 20, and the same reference numerals as in FIG. 2 indicate the same components. In addition, although omitted in Figure 2, there is a compressor relay 40 for turning the compressor on and off.
, a negative pressure valve 4 for controlling the opening and closing of the flow of engine cooling water.
1 is provided as a load of the control device 20.

The chip microcomputer 30 in the control device 20 includes a processing device, ROM, RAM. To I/O port 1, A/
It has a built-in D converter etc. The driver 3l controls the rotation of the electric actuator (forward rotation, reverse rotation, stop), the fan control circuit 32 controls the voltage applied to the blower motor ↓, and the solenoid tricycle 33 controls the compressor relay 40, which is an external solenoid, and the negative pressure valve. 41 on/off control is performed respectively.

ROM 38 for storing programs and control constants, and RA for storing data. M39 are interconnected within the control device 20 and operate based on commands from the chip microcomputer 30; RAM
These are not necessary if the memory capacity is sufficient.

A signal from the operation switch 35 on the control panel 26 built into the control device 20 is sent to the interface circuit 3.
4 to the microcomputer 30, and the current operating state of the air conditioner, the set target temperature, etc. are outputted to the indicator 37 via the indicator driver 36 and displayed to the occupant.

FIG. 4 is a flowchart showing an example of a control program executed by the microcomputer 30. First, in step J1 500, the registers and RAM inside the microcomputer are initialized to prepare the input/output environment for the air conditioner system.

Next, by repeating step 501, actual air conditioner system control steps 502 to 511 are repeatedly executed until the power is turned off.

That is, in step 502, various sensors 21 to 25, 2
Temperature signals etc. input from 7 etc. ↓Chip microcomputer 30
In step 503, the data such as the temperature signal read in the previous step is corrected for sensor non-linearity, converted into units, etc., and converted into internal data. Next, in step 504, the control target temperature TSo, which is the target room temperature, is calculated. This calculation corrects the set temperature selected by the occupant according to the outside air temperature and the driving mode so that a comfortable temperature space can be maintained without any adjustment operations by the occupant.

In the next step 505, a comfortable temperature space is created according to the deviation between the control target temperature TSn and the actual cabin temperature Tr detected by the vehicle room temperature sensor 25, as well as the values of the outside air temperature Ta and the amount of solar radiation ZII1. The target blowout temperature Tdo required to maintain the temperature Tdo is calculated. Next, in step l2 506, air mix (A./M) door 1
1. 12 opening calculations are performed. Here, corresponding duct sensors 21, 22. The air mix door 11.23 is necessary to bring the deviation from the actual blowout temperature Td detected by the air outlet temperature Td closer to O. 12 opening degrees are calculated.

The temperature control-related calculations are completed above, and then step 50
7, the blower motor control target voltage for determining the blowout air volume is calculated. Here, generally the control target temperature T
When the deviation between S a and the actual cabin temperature Tr is approximately O, the air volume is calculated to be low, and as this deviation increases, the air volume is calculated to be high. In the next step 508, the optimum air volume distribution of each outlet 6 to 8 and the internal circulating air according to the heat load are determined according to the outside air temperature Ta, the amount of solar radiation Zm, the blowing temperature Td, etc. In the next step 509, it is determined whether the compressor is on or off. Generally, it is determined that the compressor is forcibly turned off under conditions of low outside temperature where the heat load is reduced (relay 40 operates). Also step 510
Now, a decision is made as to whether to open or close the water valve (open or close the negative pressure valve) to open or close the flow of engine cooling water, which is a heat source. Finally, in step 511, the control output signals to each actuator that have been calculated above are output together, and the air mix door opening, blower motor applied voltage,
The status of the suction and outlet doors, the on/off of the compressor and water cock, and the indicators on the control panel and roll panel are controlled. Above steps 502-5
By repeatedly executing step 11, the interior of the vehicle is maintained in a comfortable state according to the conditions set by the occupant.

Here, an example of a program that is a feature of the present invention will be explained by taking steps 505 and 509 in FIG. 4 as an example. First, an example of the calculation formula for the target blowout temperature Tdo in step 505 is shown below.

Tdo=f (Ta)-Kz-Zm+Kr (TS[l
Tr)=40-Ka-Ta-Kz-Zm+Kr (
TSQ Tr) − (1) where f (Ta) = 4
0 − Ka-Ta: Reference blowing temperature, 'J' +]
: Outside temperature, 2 bamboo 2 solar radiation, '1゛So:
Control target room temperature, Tr: Vehicle interior temperature K. a, K
z, Kr: control constant, reference blowing temperature f
At (Ta), there is no solar radiation, and the cabin temperature Tr is the control target room temperature T.
When reaching So, the air outlet temperature is the one at which the occupant feels most comfortable, and as shown in FIG. 5, it has a characteristic that it decreases almost linearly as the outside temperature Ta increases.

When programming the operation of equation (1) using conventional assembly language, a storage area corresponding to each program variable is first defined on the RAM.

To control an automobile air conditioner, a storage area of approximately 2 by 1 is required for the most important variables due to the temperature change range and its resolution requirements. Ta, solar radiation Zm. 2 for each of the vehicle interior temperature Tr, control target room temperature TSn, and target outlet temperature Tdo.
Define byte storage. The values of variables other than the temperature Tdo to be calculated here are as follows in steps 503 and 5.
Since the values have already been calculated in step 04 and stored in the definition area, these values can be used to calculate equation (1) as shown in Figure 6 (a).
) is executed in the flowchart 15-1-. That is, in step 600, the reference blowing temperature 4.0-Ka-Ta is calculated and the result is temporarily stored in the definition area of Tdo. Here, A→B in the figure means finding A and substituting it into B. Next step 601
At step 600, the amount of solar radiation Z is calculated from the value of Tdo obtained at step 600.
The correction amount K of the target blowout temperature with respect to m. Subtract z·Zm and store the result in the Tdo area again. Next, in step 602, Kr (TsoTr), which is a correction value of the target blowout temperature based on the room temperature deviation, is added to Tdo obtained in step 601, and the result is stored in the Tdo area again. By executing the above procedure, the target blowout temperature data Tdo calculated by the above-mentioned equation (1) is obtained in the Tdo definition area. However, in each of these steps, multiplication of 2-by-1-length data is required, and in the case of a conventional 8-bit 1-microcomputer, it is necessary to use a subroutine for double-length multiplication in each step. This method of double-length multiplication is well-known, so its details will be omitted, but it requires four multiplications of ebyte-length data and addition of the results with appropriate digit alignment. , and the multiplication result will be 4 bytes long, so prepare a memory area commensurate with that.

An example of a program list in which the processing of the above equation (1) is written in assembly language is shown in FIGS. 7(a) and 7(b).

6(a) is the program of FIG. 6(a) for calculating equation (1), and FIG. 6(b) is the 2-byte length multiplication subroutine used therein. This list is an example when using an 8-bit chip microcomputer HD680 manufactured by Hitachi, Ltd., and this list is omitted from a total of about 50 lines.

Furthermore, it is difficult to understand the contents of a program just by looking at the list, and it takes a lot of time to change part of the calculation specifications without making any mistakes. Furthermore, the microcomputer HD6801 shown in this example has the function of adding and subtracting 2-byte data, so it can be programmed relatively simply.
The company's HD6805, which is often used to control automobile air conditioners, does not have the function of adding and subtracting 2-byte data, making the program even longer and more complex.

In the present invention, in order to solve such problems with assembly language, the operation of equation (1) is described in a high-level language. Figure 1 shows an example of formula (J) written in the C language, which is often used as a microcomputer control language. As is clear from the figure, the program is extremely simple.
t, and the program description itself is almost the same as Equation (1), making it extremely easy to create a program or change the calculation specifications compared to assembly language.

Next, a comparison of the compressor on/off determination programs in step 509 in FIG. 4 will be explained. 8th
The figure shows an example of the on/off determination characteristics of a compressor. As mentioned above, the compressor does not need to operate at low outside temperatures, and in order to prevent damage to the compressor due to operation of the compressor in a low heat load, generally the outside air temperature ``a'' is around ○°C or lower. Then, the compressor is forcibly turned off.Then, in order to prevent chattering at the clamping point due to the influence of minute fluctuations in {i from the outside air temperature sensor, the outside air humidity is #Hys (1' in C) On/off determination is performed with hysteresis so that the compressor is turned on when the temperature is above and the compressor is turned off when the outside temperature is below -#Hys.

9 and 10 are flowcharts 1- for the process of step 509 in FIG. This will be explained with reference to FIG. 1st
Figure 0 (b) shows F]. This shows the I.ag area. One bit of SB is used as Bcomp to store the on/off state of the compressor.

Further, [iX] in FIG. 10(a) means the area of data stored in the index register IX, and this is the data for which the magnitude determination with hysteresis is performed, that is, the outside air humidity Ta. Figure 10 (.) Steno knob 90
0, it is first determined whether the compressor is currently in the on state.

If B comp-“1”, that is, the compressor is currently on J cliff, then in step 90+ [IX-1 is set to Ta
If J3comρ=“○”, that is, in the off state, [IX:] is replaced with Ta# I{ ys l: in step 9()2. In the following step 903, it is determined whether [Cho X] is positive or negative. If this is positive, E9 If Bcomp”=”O I+, then Ta-#H
If ys>○ is B comp-“1” then Ta+
#Hys〉0 means, as is clear from Fig. 8, that the compressor is always turned on, so in step 904 B comp = ”
], ”.Conversely, if the determination in step 903 is negative, if Bcomp=“○” up until now, Ta-#Hy
s (○, if Bcomp = ``1 no' until now, T
a+#Hys〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〈〉.
Set comp="0".

FIG. 9 is the main program that executes step 509 in FIG. 4. Step 901 or 902 in FIG. 10(a)
In [IX. ] is always rewritten, so the value of the outside air temperature data Ta must be set in the register IX every time the process shown in FIG. 10(a) is started.

Therefore, as shown in FIG. 9 (1)), W o
A working area called rk is prepared separately from the area for storing Ta. and step 80 in FIG. 9(a).
At step 0, the value of the outside air temperature Ta is copied to the work area, and at step 801, the value of the outside air temperature Ta is copied to the index register.
After assigning the address of the rk area, ie, #Work, a subroutine is called in step 802.

Lists in which the processes shown in FIGS. 9 and 0 are described in assembly language are shown in FIGS. 11(a) and 11(1), respectively. Although the number of program steps is very small compared to the above-mentioned FIGS. 7(a) and 7(b), it is still very difficult to read what processing is being performed by the program only from this list.

FIG. 12 is an example of a program in which the above judgment process 509 is written in C language.As far as the number of program lines is concerned, the number of lines in the program is not as low as that in the conventional FIGS. 11(a) and (b).
The contents can be easily understood by engineers who work with C language, and the characteristics can be easily changed.

As explained in the embodiments shown in Figures 1 and 12 above, by writing the control program using the C language, which is a high-level language, the number of lines to write the program can be reduced (particularly the processing of numerical calculations is reduced). ), the contents are easier to understand, and program specifications can be changed and operation contents can be easily and reliably verified. In addition, for typical high-level languages such as C, high-quality compilers are already provided for most general-purpose microcontrollers, and even if the structure of each microcontroller is different, if each microcontroller is equipped with a dedicated compiler, The same control program can be used.

On the other hand, an area is required to store the compiler and the translated object 1-program (4! However, the processing speed is usually slower than programs written in assembly language. However, as described above, these increases in memory capacity and decreases in processing speed can be fully absorbed by the hardware.

Next, as another embodiment of the present invention, the calculation of the arithmetic expression (1) and the on/off determination process of the process shown in FIG.
Examples written in the high-level language BASIC are shown in FIGS. 13 and 14, respectively. When compared with FIGS. 1 and 12 using the C language, the number of lines of the program and the ease of understanding are almost the same, and the same effect as when using the C language is obtained. Furthermore, the BASIC language is widely used as a language for personal computers, and the range of people who can create or change programs is wider than that of the C language. At the same time, the BAS IC language is called an interpreted language, and even in the program execution environment, changes and additions to the program can be easily made by temporarily suspending the program, so it is possible to immediately update the specifications when the program specifications are being developed. This has the effect of being able to deal with this.

On the other hand, BASIC languages generally have slow processing speeds, but with improvements in the processing power of microcomputers, the problem of processing speed is being resolved. A model with a built-in BASIC interpreter for directly executing a RASIC program has also been announced, which further improves the required ROM capacity and processing speed. In addition, 13 ASIC includes intermediate code (I code) interpreter systems and computer 23 24 compiler systems similar to the C language, and by using these, you can create a program as a product. This makes it possible to make the system more compact and to speed up program processing.

Other high-level languages are equally applicable, and faster, more compact, specialized high-level languages specific to car control and air conditioning control can also be designed and used.

Next, as another embodiment of the present invention, a process development device and an automobile air conditioner are connected, and the air conditioner is controlled by a program written in an assembly language or a high-level language on the program development device. l5
As shown in the figure. Here, program development equipment includes functions such as an editor used for creating and modifying programs, a compiler for translating created high-level language programs, an assembler for translating assembly language programs, and a debugger and emulator for checking and evaluation. It is used to create and modify OS and control programs for one-chip microcomputers.

The upper block in FIG. 15 shows an example of the internal structure of the air conditioner control device 20 in FIG. 2. What is different from FIG. In addition, signal lines from the interface circuit and driver circuit to each input/output terminal are led out via a bus line 43, and an interface 42 is provided at the input section of each sensor 23-25, 27.

On the other hand, the lower block in Figure 15 is the program development equipment [5
9 shows an example of the internal structure of a microcomputer 45, ROM.
46, RAM. 47, timer counter 48, storage device 5
0. 51 (floppy disk, root disk,
(optical disk, bubble memory, etc.), keyboard 53, display device 55, externally connected general-purpose word measurement device 57, processing device 58 (printer, blotter, data logger, EPROM writer, etc.), interface circuit 4.
9, 52, 54, a general-purpose interface circuit 56 for connecting the program development device and an external general-purpose device
(RS-232C, etc.), bus 60. The bus 60 and the bus 43 of the control device 20 are connected by a connector 44.

As shown in the second configuration below, the program development device 59 is equipped with a real-time multitasking OS, and has a large-capacity RAM 47 and large-capacity high-speed storage devices 50, 5.
．． 1, it is possible to operate editors necessary for program development, various assemblers, high-level compilers and interpreters such as C language and BASIC language on the real-time OS, and the extracted data path 60.
The control device 20 can be directly operated by the microcomputer 45 via the AC1. O
It can also be operated with OV or automotive DC power supply. Therefore, this program development device can be used to create an air conditioner control program in assembly language or high-level language, run the program on the microcomputer 45'2, and directly control the vehicle air conditioner via the control device 20.

In particular, in driving test 1 for evaluating comfort in an actual vehicle, the entire system is driven, and the program development device 59 executes air control, and the multitasking function is used to read data input from each sensor, Calculation data inside the control program, operating status of each actuator, and 11T read through a general-purpose external device
．． The temperature, pressure data, etc. of both parts are stored in real time in a storage device 50 such as a disk. 51 and prepare for later analysis, as well as a display device 55 and a measuring device 57.
The changes in each data are displayed in real time, making it possible to modify or recompile the air conditioner control program even while the vehicle is running. Note that when using the program development device 59, the control device 2
0 is not required.

Furthermore, the control device shown in Figure 3, which is the final product, can be equipped with a common OS that removes only the functions unnecessary for the product from the OS used in the program development device of this example, and the operation can be verified without any other changes. You can obtain a complete control program.

The OS that can be used for program development equipment is OS9, which is currently a typical general-purpose product, and I-T.
Although there are RON, μ-TRON, and other real-time OSs provided by microcomputer manufacturers, it is also possible to develop and use a compact, high-performance OS specifically for this system.

According to this embodiment, it is possible to significantly shorten the period for developing a control program and changing specifications, and to significantly improve the quality of the program.

Next, FIG. 16 shows an embodiment in which input/output of signals and data is realized by system call operations on the OS without directly controlling the input/output interface address from the program.

This is an example of a program that outputs the calculation result from the CM command running on the OS. output to the actual output boat.

According to this embodiment, even if the address of the input/output port or the input/output procedure changes due to a difference in the structure of the control circuit or the parts used, all of these differences can be absorbed within the OS. The control programs, including the input/output processing program shown in FIG. 16, are not affected at all. -28 When reusing a control program for another model, or
Even when applying a control program created on the program development device shown in Figure 5 to the device shown in Figure 3, which has different input/output addresses, etc., the control program can be used as is without any changes, and the control program development is easy. This has the effect of significantly shortening the period and significantly improving the quality of the program.

Although the embodiments of each type of microcomputer have been shown above for the control of automobile air conditioners, there are many uses of a one-chip microcomputer, such as engine control, and it goes without saying that the present invention can be used for these as well.

[Effects of the Invention] According to the present invention, a high-level language makes it easy to create programs and the contents are easy to understand, so even people other than specially trained programmers can easily create, change, and verify control programs, and the program can be easily adapted to different models. Since the structure of the microcomputer is hidden by the compiler, there is an advantage that the same control program can be used even if the microcomputer model or parts used are different. In addition, by using a common OS for the program development device and the control device, it is possible to modify or change the control program during testing or at any location on the outdoor vehicle during the product development period. The program has the advantage that it can be used as is in the control device without major changes, and it is also possible to easily record arbitrary data inside the microcontroller during the product development period.
Can display and analyze such data (processing such as graphing)
can also be done automatically. Furthermore, by using system calls to the OS for input/output processing of the control program, differences in addresses related to input/output can be absorbed by the OS, so compatibility of the control program can be further improved. In addition, this has the effect of significantly shortening the period for developing control programs and changing specifications, and greatly contributing to improving the reliability of these programs.

[Brief explanation of drawings]

Fig. 2 shows an example of a control program that is a feature of the present invention, Fig. 2 shows the overall structure of an automobile air conditioner and its control device, and Fig. 3 shows an example of the internal structure of the control device. Fig. 4 is a flowchart showing an overview of the control procedure of an automatic military air conditioner, Fig. 5 is a diagram showing an example of the characteristics of the standard outlet temperature, and Figs. 6 and 7 show the calculation procedure of the target outlet temperature. Figure 8 is a diagram showing an example of the on/off characteristics of the compressor; Figures 9 and 10 are flowcharts showing the procedure for determining whether the compressor is on/off; 12 and 12 are diagrams showing an example of programming the above determination procedure in assembly language and C language, and FIGS. FIG. 15 is a diagram showing an example of a program development apparatus that is a feature of the present invention. FIG. 16 is an example of a program that performs input/output using OS system calls. It is a diagram. 20. Control device, 30. 1-chip microcomputer, 43. 6
0...bus, 44...connector, 45...microcontroller,
46. ROM, 47. RAM, 59. Program development device.

Claims (1)

[Claims] 1. An embedded one-chip microcomputer for an automobile, characterized in that it has a ROM, a RAM, and an input/output port, and a control program running thereon is written in a high-level language. 2. The high-level language is C language, C^+^+ language, or B
2. The built-in one-chip microcomputer for an automobile according to claim 1, characterized in that the ASIC language is used. 3. The embedded one-chip microcomputer for an automobile according to claim 1, wherein the high-level language is translated into machine language and executed by a compiler or an interpreter. 4. The built-in one chip for an automobile according to claim 1, which has an OS having common specifications with an OS of a program development device, and the control program written in the high-level language runs on the OS. Microcomputer. 5. The embedded one-chip microcomputer for an automobile according to claim 1, wherein the OS has real-time processing and multitask processing functions. 6. The built-in device for an automobile according to claim 1, wherein the built-in device has an OS, the high-level language operates on the OS, and input/output operations from a control program are performed by system calls to the OS. chip microcomputer. 7. The embedded one-chip microcomputer for an automobile according to claim 6, wherein the OS has a common specification with an OS for program development. 8. A device for developing a control program for use in an embedded one-chip microcomputer for automobiles, which has an OS with common specifications to the OS of the one-chip microcomputer described above, and is controlled by the one-chip microcomputer through an interface means. The control target equipment can be controlled by the control program set in the own device, and the input/output data with the control target equipment at the time of execution of the control and the intermediate results of the control program execution can be stored in the internal storage device. A program development device characterized by: 9. The program development apparatus according to claim 8, further comprising a general-purpose interface means with an external device.